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Add a 50/50 mix of Dex-Cool antifreeze and distilled water. You can also buy it premixed. If your coolant is low then you more than likely have a leak. You may also have a blown head gasket which is very serious. Symptoms of a blown head gasket are white smoke from the exhaust, loss of coolant with no apparent leak, oil level overfull, a grey foamy substance on the under-side of the oil fill cap.

If the water pump and thermostat have been replaced and the system has been properly refilled and bled , the only thing left is the radiator. If coolant is not flowing through it properly , vehicle will run hot. If your car has overheated to the point of boiling over , your new thermostat may now be damaged again.. As for the fans , they only come on when the coolant reaches a certain temprature. Under normal driving conditions , they would not need to come on while the vehicle is moving , as the air flow from driving down the road would be enough to cool the engine.

It's OK to use Prestone 50/50 Prediluted Antifreeze/coolant. But, it needs to be DEX COOL. There is a reason for it. The seals and the water pump in the cooling system are made to run with the DEX COOL. Anything like a non-compatible coolant will cause problems down the road. I wouldn't risk it. They do make 50/50 DEX COOL.

Problem isn't with plastic, its with aluminum... If you shorten the service intervals "normal" coolant will work equally well but you cannot extend intervals or acid buildup will make short work of radiator, heater core and cylinder head(s). As far as I know, you can get two years from normal coolant but I change out about half every year on my stuff and everything is fine.

Install the engine mount struts. Notice: When adding coolant, it is important that you use GM Goodwrench DEX-COOL (R) or HAVOLINE (R) DEX-COOL (R) coolant. If Coolant other than DEX-COOL (R) or HAVOLINE (R) DEX-COOL (R) is added to the system the engine coolant will require change sooner; at 50,000 km (30,000 mi) or 24 months.

I just did a lower intake reseal on my 98 monte's 3100, it's not tough to do, the biggest part is paying attention to what pushrod came from what position and ensuring they go back to where they came from, not only for wear patterns, but for different lengths on the intake and exhaust push-rods.

I work for a GM dealer in northwest montana, and I can say it's not cheap labor-wise, generally around 6 hours of labor and around 300 in parts...it can add up quick, but when those intakes start leaking oil and coolant, things can go sour quickly...espeically if coolant starts leaking into the engine, not good for bearings.

Dex cool is not the problem with these gaskets leaking, it's common on 3100's, 3400's, 3300's, etc, any motor from that series that has that style of lower intake is prone to the issue, the rubber/plastic/composite will eventually warp, break down, crack, seperate from hot and cold cycles, I've seen it all too many times. Dex cool is the best coolant out there, there's a reason that prestone, peak, zerex can't compete, in fact a few of those blends are blends that are less efficient that Dex that GM decided not to patent. But the Dex patent is due to run out soon to the point everyone can start using dex. One issue with dex is the "gum-up" problem when the mixture is not ideal and the level is left low, but flushing and setting proper mixture (50/50) and level will alleviate this problem.